Title: Lingering Oil and Sea Otters: Pathways of Exposure and Recovery Status
Project Year and Number: 2004: 040775
Principal Investigator (PI): Brenda Ballachey, DOI
Assisting Personnel: Jim Bodkin
Research Location: Prince William Sound
Restoration Category: Research
Injured Resources Addressed: Sea Otters
Abstract: Some of the strongest evidence of continuing effects of lingering oil from the Exxon Valdez spill comes from long term monitoring of sea otter populations and their exposure to hydrocarbons. Sea otters in heavily oiled areas of western PWS had not recovered as of 2003. Through 2002, sea otters continued to exhibit elevated levels of the cytochrome P4501A biomarker in areas where lingering oil deposits are most prominent. In 2002/03, sea otters at northern Knight Island were instrumented with radiotransmitters and time-depth recorders. Ongoing monitoring of these individuals is quantifying home ranges relative to known intertidal lingering oil deposits, and when the dive data are retrieved and analyzed we will link foraging behaviors of individual sea otters to oiled shorelines and relate patterns of habitat use to individual variation in cytochrome levels. For FY2005, we propose to conduct surveys of population size and distribution, continue to monitor instrumented sea otters to obtain habitat use and survival information, and obtain an additional sample of cytochrome P4501A. This will allow evaluation of continuing exposure to residual oil, population trends, and the status of recovery of sea otters in western PWS.
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Proposal: View PDF (1,077 KB)
Funding Recommendations: View
Other materials associated with this project: View
Final Report: Pending re-evaluation of lab results.
Publications from this Project: None Available
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|Project Number||Proposal||Annual Reports||Final Report||Data|
|2006: 040620-2||View (PDF)||
2005: View (PDF)
2004: View (PDF)
|See Project 040775||See Project 040775|